Reversing mechanism for internal-combustion engines



Y R. BARBOUR. REVERSING MECHANISM FOR INTERNAL COMBUSTION ENGINES.

' APPLICATON FILED AUG.H 1920- 1 &1 @3199 Patented May 16, 1922.

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' ROBERT reasons, or IPAT'ERSON, new messy.

REVERSING MECHAEISM 330R, IN'IERNAL-COIVIBUSTION Specification of Letters Patent.

Patented lliay Mi, 1592323.

Application filed August 11, 1920. Serial No. 402,929.

Mechanisms for Internal-Combustion lhn gines, of which the following is specification. I I i This invention relates to engines, and it has for its object to provide, in combination with a rotary part of the engine and instrumentalities driven thereby for imparting impulses at two different points in its cycle, and with meansto be actuated from said instrumentalities, improved mechanism for selectively transmitting the impulses of said instrumentalities to the means to be actuatedr As herein shown and described my invention contemplates the means to be actuated to include a Valve of an internal combustion engine of the. typewhich adapted to be driven either forward or backward. the aforesaid rotary part to be its cam-shaft and the aforesaid instrumentalities to include the cams on said shaft from eitl er of which, according to the position of the aforesaid'niechanism, the valve is actuated; my invention, however, is not correspond ingly limited, as will be evident from the appended claim. Y 1 y In the drawing,v

Figure 1 is a vertical sectional view show ing thecam-shaft of an internal combustion engine, the impulse-impartinginstrumentalities driven thereby, the means to be actuated, and the improved mechanism for selectively transmitting such impulses to said means;

Figure 2 is a sectional view taken at right angles to the plane of section of Figure l and showing the principal parts seen in Figure 1;

Figure 3 is a plan of the improved mechanism, detached.

The lower part of the casinga and the crank-case Z2 have a pair of holes 6 each of which receives a bushingf which is kept against vertical movement by a flange g thereon'held between the casing and crankcase, and on the lower end of this bushing is a-sleevc it which llpWTU'Clly abuts the (rank-case. In the bushings are'push-rods i which are held normally pressed down by spiral springs 7' (abutting sleeves it) against two cams 7c fixed on the cam-shaft c in such my invention is not limited to the ei'nploy ment'of intermediaries, such as the pushrods constitute, between the cams or other primary impulse-imparting members and the means to be actuated. I

The upper part of the casing a has an upstanding hollow pillar Z, and in this is held by a screw on a bushing a, the lower part of which (withiuthe casing) has a lateral under-grooved or saddle portion 0, this bushing is alined with the guiding ferrule cl. In it .is arranged a push-rod constructed in two parts as follows: The lower part 7) has a lateral extension Q straddled by the portion 0 of bushing 01 and it has a stop-device 1""(shown as two nuts) screwed thereon and adapted to contact with the top of the pillar to limit the downwardmovement of the push-rod; the upper part is a stem 8 screwed into the upper end of part 7) and having a shoulder t between which and the ferrule cl a spring t is interposed, acting normally to hold the push-rod to the downward limit afforded by contact of the stopdevice 1" with the pillar. Screw m may engage a slot m in the puslnrod, thus forming a spline and keeping the push-rod from turning.

The extension or head. 9 of the upper push-rod p-8 directly overlies the upper ends of the two lower push-rods 2'. The adjoining end-portions of the push-rods, i and 19-8, are rounded as viewed laterally (Figure 1), and at one side they have converging cam-faces u u formed preferably on lateral projections ow, the projections o being respectively on the lower push-rods and the projections w being a pair on head 9 oi the upper push-rod. One of the projections to is preferably formed with a depending toe w for a purpose to be stated. The projections 41 may engage slots o in bushings 2' to keep the lower push-rods from turning.

The bottom of the casing a at the side of the push-rods adjoining their cam-faces au is formed with two rests w w, the top of each of which is about level with the upper ends of the lower push-rods when fully depressed.

Journaled in the case a at the same side of the push-rods and on a horizontal axis is a rocker including a shaft 7, having a suitable handle a for manually rocking it, and a two-armed crank 2. On cranlopins 3 of this crank arranged at points in two different radii from its axis, that is, in the respective arms thereof, are pivoted fingers l constituting the aforesaid impulse-transmitters. Their free ends are rounded and they are adapted to slide on the rests w w, the rest 00 being preferably inclined upwardly for a purpose to be explained. They are respectively arranged inthe same vertical planes as the lower push-rods and hence are respectively opposite them and also opposite the headg oi the upper puslrr'od. Their length is such that when the rocker is turned one way or the other, one finger will wedge itself between the corresponding lower push-rod and the upper push-rod and the other (previously occupying that position with respect to the other lower pushrod and upper push-rod) be withdrawn.

The throw of the cams 7c is insufiicient to raise the lower push-rods so that they will directly move the upper push-rod and hence the valve. Therefore, according to whether the rocker is moved to the one or the other of its limits, thus interposing one finger 4: between the corresponding push-rod i and push-rod p-s and withdrawing the other finger from a corresponding position, the valve will be actuated from whichever cam is rendered effective by the presence of the interposed finger, i. e., at one or the other of two points in the cycle of shaft 0 and hence of the engine. The valve will therefore be adapted for the running of the engine forward or back according to the position of the mechanism 1 2, 3, 4.

The incline w allows the relatively lower finger 4 to perform its thrust without undue oscillatory movement, otherwise incident to its crank pin 3 being below theshaft and the toe w insures the end of this finger being cammed downwardly along the camface u as it performs its forward thrust movement.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is The combination, with a pair of upward thrust-imparting members moving in alternation upward to substantially the sameplane, a rocker arranged ona horizontal axis approximating said plane and equidistant from said members, and impulsetransmitters pivoted to said rocker one above and the other below said axis and having free ends projecting toward the respective ROBERT BARBOUR. 

